COPEPODA 85 



The shape of the body is in the main like that of the adult, but the articulation between the 

 head and the first thoracic tergite was complete at least in a single specimen; a well marked fifth 

 somite bearing the lateral spines was found. The abdominal somites are as usual four. The male 

 differs from the females by the presence of a fifth pair of legs without any endopodite, corresponding 

 to the structure in the adult males (PI. II fig. 2 b). 



Occurrence. The Ingolf Expedition has curiously enough not gathered any specimen of this 

 species, but the Thor has taken it at the following stations. 



/e 04 St. 154 6s27 L. N. 27io L. W. Yt. 800 M. Wire 85 f ?, i y? (V). 



22 / 7 04 SL 214 &7i9 L. N. i755 L. W. Yt. 800 M. Wire 67 f . (one with spermatophor), i y .. 



*3/ 7 04 St. 216 66i5 L. N. I2i3 L. W. Yt. 600 M. Wire i f?. 



9/ 5 04 St 70 6335 Iy. N. 62o L. W. Yt, 100 M. Wire 12 f?. 



2 3/ 7 05 St 124 6io4 L,.N. 433 L. W. Yt 100 M. Wire i f?. 



The Danish East Greenland Expedition 1900 has gathered the species three times. 



4/7 1900 3 p. m. 79og L,. N. 436 L,. W. Vertical net 300 o i f $. 



8 / 7 2 p. m. 7409 L. N. n3i L,. W. 4000 2 f ?. 



2 -t/ 9 12 p. m. 6io6 L. N. i626 L,. W. F. 392 2 f ?. 



Distribution. Nan sen's North Polar Expedition found this species rather abundantly from 

 the surface down to a depth of 300 meters. By the S/S Michael Sars it has been taken twice in the 

 open sea about midway between Iceland and Norway. According to Wolf en den this species occurs 

 sparingly in the cold underwater of the Faeroe channel. By the Due d'Orleans this species was found 

 at eleven stations, most often between 300 and 600 meters, as far north as 78 N., as far east as 5 I/. E. 

 and as far west as 16 L,. W. In L,ille Karajakfjord it was taken by Vanhoffen on the west coast of 

 Greenland. 



Taking into consideration the new localities enumerated above, it seems right to regard the 

 species as characteristic of the deeper layers of the Arctic seas. 



Remarks. The male which Wo If end en has described as Ch. Vanhoffeni is certainly identical 

 with that discribed by G. O. Sars as Ch. obtusifrons. The species, which A. Scott with doubt refers to 

 this species, does certainly not belong to it, on account of its smaller size and more robust body, not 

 taking into consideration the distribution. 



20. Chiridius gracilis Farran. 

 (Text-figs 21 a d). 



1905. Chiridius Poppei Giesbrecht. Farran, p. 35. 



1908. gracilis n. sp. Farran, pp. 3031, pi. II figs 



1909? Chiridius? gracilis Farran. A.Scott, p. 42, pi. XI figs I 3. 

 1911? polaris n. sp. Wolfenden, pp. 211-212, taf. 



XXIV figs 9 12, text-f. 6a-b. 



Description. Size: 2-69 mm.; anterior division 2 - oo; abdomen 0-69 mm. Farran's specimens 

 measured 2-4 2.8 mm. 



